I use the function get_data() in the following way:
index_id = ['US0378331005', 'CH0244767585', 'IT0003796171', 'JP3246400000', 'CH0038863350', 'HK0267001375', 'AU000000ORG5', 'BE0974258874', 'PTEDP0AM0009']
data, err = ek.get_data(index_id,['TR.isPrimaryInstrument'])
and the return is a serie of string "True".
Now if I use this function with another set of index_id, it will return 1 and 0. Why is that behavior and how to avoid it?